管理信息系统的报表统计策略     

黄艳  谭同德  朱会东  唐浩 《南阳师范学院学报》2003,2(12):52-54

总结了在管理信息系统开发中一般报表统计的常规策略，并特别针对育龄妇女管理信息系统中报表统计处理数据量大、统计速度慢等难点和关键问题，给出其报表统计模块的具体实现方法。  相似文献   

Understanding storage environmental stability during power outages: A key issue in sub-tropical climates     

Edward Kinfai Tse 《文物保护研究》2016,61(1):31-36

Efficient air-conditioning systems facilitate climate control in modern museums, libraries, and archives. The climate in Hong Kong is typically hot and humid, so the survival of collections is highly dependent on 24-hour air-conditioning systems to maintain the desired environment in repositories of archives and books, or artefact stores. The continuous operation of such systems in turn relies on a number of factors, such as uninterrupted electricity supply, an active maintenance programme, daily monitoring of their performance and quick response to irregularities as well as backup or alternative systems to support the air-conditioning load in case they are down for servicing. From the risk management point of view, unlike the latter four factors, electricity supply is an external factor that cannot be guaranteed. Fluctuation in the power level that results in stoppage of air-conditioning equipment is not uncommon even in well-developed countries. Long power outages could be catastrophic as they might lead to irreversible damage to collection items as a result of fast, large, changes in temperature and relative humidity (RH) towards the external environment if the air-tightness or hygrothermal stability of the storage are not good enough. Understanding storage environmental stability, especially during electrical power disruptions, is an essential part of the preservation measures and disaster preparedness necessary to protect valuable collections in cultural heritage institutions in the region.  相似文献   

保安员队伍稳定性研究     

朱卫平  李振文 《华中科技大学学报(社会科学版)》2001,15(1):86-88

我国现代保安服务业兴起于２０世纪８０年　代中期，是实行对内搞活、对外开放和商品经济发展的产物。文章通过以武汉市保安服务总公司保安员为研究对象，运用社会学、社会心理学理论，分析影响他们职业稳定性的内在因　素和职业环境的若干因素，并且提出解决问题的相应对策。  相似文献   

DNA生物大分子的动力学特性与生物功能(Ⅱ)     

庞小峰 《商丘师范学院学报》1996,(Z2)

对ＤＮＡ中激发的孤立子进行了分类，同时也研究了它的一些特点．我们着重研究了用此理论解释ＤＮＡ的基本生物功能──复制和转录及遗传与变异等问题．  相似文献   

核心稳定训练对篮球运动员核心区域肌电、身体素质的影响     

宋金庄 《湖北体育科技》2016,(1):23-25

以中国戏曲学院篮球男运动员为研究对象,运用文献资料法、实验法、数理统计法对核心稳定性训练对篮球运动员核心区域肌电身体素质影响进行实验研究,探讨核心稳定性训练对篮球运动员的影响。对身体素质指标以及核心区域肌电进行实验前和实验后测试。训练每周2次,每次60min,在8周的核心稳定性训练后对核心区域肌电、身体素质的各项指标进行了测试。结果:实验后经测试发现实验组中反映核心区域肌电、身体素质的各项指标都有了及其显著性的提高(P<0.01)。结论:核心稳定性训练能够有效的提高核心区域肌电、身体素质,有助于运动技能的发挥和身体素质的提高。  相似文献   

Hip and upper extremity kinematics in youth baseball pitchers     

Taylor Holt 《Journal of sports sciences》2016,34(9):856-861

The purpose of this study was to examine the relationship between dynamic hip rotational range of motion and upper extremity kinematics during baseball pitching. Thirty-one youth baseball pitchers (10.87 ± 0.92 years; 150.03 ± 5.48 cm; 44.83 ± 8.04 kg) participated. A strong correlation was found between stance hip rotation and scapular upward rotation at maximum shoulder external rotation (r = 0.531, P = 0.002) and at ball release (r = 0.536, P = 0.002). No statistically significant correlations were found between dynamic hip rotational range of motion and passive hip range of motion. Hip range of motion deficits can constrain pelvis rotation and limit energy generation in the lower extremities. Shoulder pathomechanics can then develop as greater responsibility is placed on the shoulder to generate the energy lost from the proximal segments, increasing risk of upper extremity injury. Additionally, it appears that passive seated measurements of hip range of motion may not accurately reflect the dynamic range of motion of the hips through the progression of the pitch cycle.  相似文献   

Timescales for exploratory tactical behaviour in football small-sided games     

Angel Ric  Robert Hristovski  Bruno Gonçalves  Lorena Torres  Jaime Sampaio  Carlota Torrents 《Journal of sports sciences》2016,34(18):1723-1730

The aim of this study was to identify the dynamics of tactical behaviour emerging on different timescales in football small-sided games and to quantify short- and long-term exploratory behaviour according to the number of opponents. Two teams of four professional male footballers played small-sided games against two different teams with a variable number of opponents (3, 5 and 7). Data were collected using a combination of systematic observation and a non-differential global positioning system (15 Hz). The temporal diversity and structural flexibility of the players were determined by calculating the dynamic overlap order parameter q, entropy and trapping strength. Analysis of the exploratory dynamics revealed two different timescales, forming a different metastable landscape of action for each constraint. Fast dynamics lasted on average a few seconds and consisted of changes in tactical patterns. The long timescale corresponded to the shared tasks of offence and defence lasting tens of seconds. The players’ tactical diversity decreased with an increasing number of opponents, especially in defence. Manipulating numerical imbalance is likely to promote changes in the diversity, unpredictability and flexibility of tactical solutions. The fact that the temporally nested structure of constraints shaped the emergence of tactical behaviour provides a new rationale for practice task design. The manipulation of numerical imbalance on the timescale of a few tens of seconds, on which the exploratory behaviour of players saturates, may help coaches to optimise the exploratory efficiency of the small-sided games.  相似文献   

C语言的指针   总被引：1，自引：0，他引：1  

杨素英 《大连大学学报》1997,(2)

以具体实例详细介绍了C语言指针复杂说明的理解方法;分析指针使用中的常见错误及解决方法;利用指针和动态分配函数实现程序运行中堆的自由空间的支配和释放。  相似文献   

功能动作测试在中学生基本运动能力评价中的应用          下载免费PDF全文

徐欣  卢洋  高亚强  仲昭金  姚卫  魏安奎 《体育科研》2016,(1):74-77

目的：采用功能性动作测试系统（Functional Movement Screen,FMS）评价青少年在完成不同功能动作模式时身体各部分的稳定性、对称性和灵活性,研究其基本运动能力及影响因素。方法：以上海市某中学中随机挑选的100名初中生为研究对象,对他们进行7个特定动作的测试并评分,并对测试结果进行统计分析。结果：FMS测试总分满分为21,受试对象FMS总分均分为14.89,总体水平偏低;女生肩关节灵活性和直腿抬高测试得分显著高于男生,但总分上男女生无显著差异;青少年在完成动作时普遍存在身体晃动、力量不足和两侧肌力不对称现象,髋、膝、踝关节灵活性受限且稳定性较差,脊柱的屈伸能力不足,两侧盂肱关节和髋关节的活动能力不对称。在旋转稳定性、跨栏架和直线弓箭步３个测试中这些不足尤为明显。结论：青少年基本运动能力水平较低,大多数人需要进行矫正训练;男女生总体上的表现差异不显著,但女生在肩部灵活性和直腿抬高测试的表现要优于男生,故男生需加强肩部和髋部关节的灵活性锻炼。  相似文献   

女子跳水单人10m台动作稳定性研究——以2015年喀山游泳世锦赛跳水比赛为例     

聂国林 《湖北体育科技》2016,(6):533-536

采用文献资料、数理统计、逻辑分析、观察等方法对2015年世界游泳锦标赛跳水比赛女子跳水单人10m台的比赛成绩、动作难度、动作组别、最后得分进行对比分析研究,提出影响中国女子跳水单人10m台动作稳定性的因素,为备战2016年里约奥运会女子跳水单人10m台项目的训练提供科学理论依据。  相似文献